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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8a16d49049247182eeb35c13c4a775b7a6baed7c8c0b3e2199e832c7498b2d' 
  AND token = 'YwWoaPLARCR+6HxGy0i19ArOAykWz3CWdh7/CZRbyLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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