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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21be1e06ec36954a3ba1228e2bdd71f028903add0752162876e3fcf920ab87ba' 
  AND token = '3eFNlXYza1xbwKL4l3NPxP2t2BGZiOn9pV6+8M6p4fQ=' 
  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"
    }
  }
}