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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7012287c44670578f49efb573a9e2fa0f6ed5a2f3cb2edb5ad269edad77fe575' 
  AND token = 'NM0SShO7eEh1p6ytPJiYGV+UUk0xpg5f/A+qtX1AiU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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