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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ffe0c7dda5594d4a69304aabb0c9ee1b9ff9040a6187e7bb4240366bec966d' 
  AND token = 'Uq9ZH+EHmI0n9cycsrRKUEwpwit1EyN/i/MFxPH47S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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