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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f885dd338c0cda4aa69572e60607cf2dd6aed102b65d48c9ff743ba7689489' 
  AND token = 'BS2WyC09SkrW8esF1ZLzOTCB4eKQzO7v/C+Kk2hSlEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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