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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c62a67908b1e230cd490bb471280bcf95f99afc5130710e0b1b734c37698b6b' 
  AND token = 'bkrueAg3x0sJJhp1/Y5DzMnFCtCwFEAWROgcN2QqL+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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