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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8b99479e565e9681aa0d4ded95788ca2f3f8b63c1860a34949dc345ede0bad' 
  AND token = 'DxpxCCEkeR5vBeqra8HVOjM7+kL7K+Fk5Sw5g1Czgms=' 
  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"
    }
  }
}