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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0175105b07f58dfce48e64c9db2b417c70fee1e69607ded85fd3c7dd2e4662c' 
  AND token = 'KX57HlVeXW5esAUTCJQ8xecpd5+Gl4lK3M6T47bpms0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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