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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fef75d4013042faa9b565458fccfa52a1bc9b8e433e155a53f27c607b06cb19' 
  AND token = 'slX4p5WnUKtj4BHlKy+VmO5UWUfzweAP6G34B+iaqa8=' 
  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"
    }
  }
}