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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cbce3a33f85d5df3c03279322d608c7c767776a93ecf11c7d2ce29280ea9d6' 
  AND token = '420iwREJn8tBeOSHsprUE0RzVREBaoBlcDRP+o3n0GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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