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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ea292b8987c232b3f0c0c04df14030b416abc6e9b18701b3736952f3d6cd95' 
  AND token = '2QeFNfQmeEuiPhIUBDLI36Zl8oPK4HrWIokprjUf3Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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