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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619bd9c8c43b76d9027989f82729adeb58a7d7a1296f223c6f33d48401dce2a2' 
  AND token = 'fm0nuxAm63EXZv86+HkENRIbcx+c2HrBHNTVi/tafsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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