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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b72ba1913c9b9134d10a615ded0bafba623a5806af809c37f002455aa50cde1' 
  AND token = '+8QjKKkJ2FjnVNkGZcDkJnAv4hX/R2Ghrakp6PAL0mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}