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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec95c0c223b57741c8491d9fba533b63db4fe75fdfa117bf35bb2cff322d3aa' 
  AND token = 'u15iqD9d1Z8OmfSm/hhRIRRTT0cm3lW1/2NoRhSaE9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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