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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8e982e4c0216a1265555b3515191d19584625c97e23971190e054cfa58c0b3' 
  AND token = '1CUtpcIR/ODPUaeBZtZnuAb1RwuMjL3WtbFNaW2R7nA=' 
  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"
    }
  }
}