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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087fce79c170b38d2552af3c8abe58cc32f0d171356644acd28083310ebd531c' 
  AND token = 'jHq6peqWRm0sD4DVwBUChzqnGV0Wr/ykobb9GI2zN8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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