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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f9d4e112f61b7c9d71659595fd500fc858cd972a55fd2e36dffd4d2a7df52a' 
  AND token = 'Og9UmvqS2RtfOKgt7Jbik2FyfbuWQejD2PTO8IU4AhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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