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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6736143d1dc98579fec82bade2815ff2b4df9a7580c03e33e432f83d385ea98a' 
  AND token = 'g3lL7pTklCOP/Mj2eLHEXtwQ2Z7SaupgBJs3Gqe6OUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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