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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c971a1cff226bddfd2b62246cc37e0807973f0a6798435852f98fde9d11697d' 
  AND token = 'U6hgHuITsm0GqqU6yjedpf8opmT1f7tMoj8k7C3aHMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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