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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec17f71b57796a01701662b2b8dbdc0fd6b51620ee806d244abb1c5af3a5d8a' 
  AND token = 'MiMVk5ct7+4HjDHAr/m7a3NA8L+Ls20O9p2s/fByZgc=' 
  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"
    }
  }
}