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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b1e7a4a7c4d77114af5686a30248fb10c83607e0ad5182dc0900cbb21c9817' 
  AND token = 'p07ZuTYc1Mws1Ol94VrL3GqcjFlsyED4Z12crWi2AkY=' 
  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"
    }
  }
}