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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291835b308ea05b3a353d0dee52e09a995aaada941c9774af3af2e969d21dc0a' 
  AND token = '2z+X+u3oJjCS+eYdGL+2GlvCpC2XGrikc1W7AjwOGkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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