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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d59ba11629b718bdf16f0022eb28fede44cbfc3482e7ee18ab393a0b3f8cc5f' 
  AND token = 'VerCvkVhZulCxs+UeWMvQt9ADHkcWmoD2i7xCK4+l6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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