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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06dad3a863e2f5cf0b63c8b99104b8e4a752f7a7d5d2bf89dbd0b797fa8a1d7' 
  AND token = 'jkckiqzHe/YO7nKscSN60/gAuvW3m8ymsrip45V0EVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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