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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bffeb8c128119f25b5b2009e415178aca50ec3d93ac0579d245c7b683cdfea6' 
  AND token = '7cz2XlmD/pTyhxX64Nk0pPqfYQlmXDmAIxkTUV2+tAM=' 
  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"
    }
  }
}