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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a419ec53a9912ccaa841a796e58f82c53acc734f73c6d6d2b54371d0062e4d' 
  AND token = 'RDGuSc5pmmUv6ub6iHHcj04GXreVDW3qWGsGrp8GehM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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