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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daefae8a3fa4b279f1a5b4223289a739a6929beab18c9be94b2de9a82ea955e1' 
  AND token = 'OpxHEQmHA/w808HSGslQtGIr6Ch/haJv/X4gAsGbzsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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