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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b8066e8cdd904a8c09a98cb74617e0d5a7ea3086a9485d88bb694971435226' 
  AND token = 'I3F09GqNkijZWZa7wAC058DfC0JreL2e+KvOaqng/Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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