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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c7c5224e55c5c65735b3b7420df2f66baffe1ccba75f05a42b6123275984e3' 
  AND token = 'G5VY3uAXCR85om6Wh0T4CF2XsBNjF8CpM1pbUL/7BRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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