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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7df10f5640d92e9ecf43aa1166722d490417ca4d78b63c23a620b9941362fe4' 
  AND token = 'x+rG9wUoBm+CCWtG+sRJQ1WKz0nO79kau3hoW47853Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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