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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bef78d4b3f24a6478be535cfba2c13f900ea78fdc293141726b18a2723e832' 
  AND token = 'dQy2PQC1W84z+MMWR5h7gVOJ3Fg7KyVYzdRPRZpoahw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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