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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f8ca3d2ef4b0b0b0caf33e4c0bce7136b6531e4ef242933dea4cfb29875285' 
  AND token = 'IVGSm1FQhC+mifs4n6E4Bp7Dm0X15xm1+xTGZLcoGmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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