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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cadd578fc3634ceca2960532b64943f4479102f05a5fbb2700cb51938ca2be' 
  AND token = 'IcdTt0BZP2bIeqj834C5UHAlBHe5Q3kBi6hfVSLjMrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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