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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01d7373af7ac8b2f144e966a62ba072ebd9556a6c2f8648dc22abd82a9908cfd' 
  AND token = 'JOsys4YWu8Y+5kfy5WSl7hCRKFWpMFTEC7iUsJovXLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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