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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce82795c66f14a9c311695f8bc03ff234ceec06512c0a0b4fd4ae9021cfc93e' 
  AND token = '9iJM+ENeu8QrW2I4/EGCNTtUXFbcxLInvjduS5m2ba4=' 
  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"
    }
  }
}