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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a7f6ccadedbd3c11ba4b35a45ec97c2adc8418874cbfd7f04eb17c80b661e5' 
  AND token = '36lEB7tFQ2z8zng6RECbXMlO0rQ+cR9M+q+uGJ95AUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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